<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>documentName</title>
  </head>

  <body>
    <p id="revese-countdown">10</p>

    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
    <script src="./9/jquery.animateNumber.min.js"></script>
    <script>
      $('#revese-countdown')
        .prop('number', 30)
        .animateNumber(
          {
            number: 0,
            numberStep: function (now, tween) {
              var target = $(tween.elem),
                rounded_now = Math.round(now)

              target.text(now === tween.end ? 'Launch!' : rounded_now)
            },
          },
          10000,
          'linear'
        )
    </script>
  </body>
</html>
